JPS62265543A - Electronic clinical thermometer - Google Patents

Abstract

PURPOSE:To accurately set the reference point at the start of measurement, etc., by resetting internal data when the measured value of a temperature detecting means decreases by more than a specific value or when a specific decreased value continuous for a certain time. CONSTITUTION:A CPU 10 reads the detection signal of a temperature sensor 5 at a constant sampling period, and outputs the signal to a display device 5 which storing it in a memory 12. The CPU 10 has a function which successively updates and holds the peak value which is the highest value among measured values during measurement, an estimating function which calculates the estimated value of convergence temperature from the measured values, a function which determines a decrease of the measured value, a resetting function which resets the internal data, and a start setting function which sets the start time of the measurement, and when the measured value decreases suddenly or when a slight decrease continues, the internal data is reset and a measurement start time is set.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an electronic thermometer that updates and stores peak values among actual values during measurement.

(b) Conventional technology Generally, electronic thermometers use a temperature sensor to detect body temperature.
The actual measured value of this temperature sensor is measured at a predetermined sampling period.
The peak value of the actual measured values is stored in the PU, and each time this peak value is updated, it is stored and displayed on the display, while the convergence temperature is estimated from the actual measured value and this estimated value is actually measured. Some devices are configured to display the value on the display instead of the value.

(c) Problems to be solved by the invention With the above-mentioned electronic thermometer, there are cases where the measurement is continued after the measurement has been completed, or when the outside temperature is high, etc.
There are times when the temperature sensor is kept warm. If you turn on the power switch and start measurement in this state, the peak value that was kept warm will be maintained as it is. In other words, as shown in Figs. 6 and 7, when the measurement starts from the temperature-retaining state, the actual measurement value of the temperature sensor drops once to the broken line M + ), then rises to the solid line M as in normal measurement, and then converges. The temperature will approach the temperature, but in order to maintain the peak value, the temperature at the start of measurement should be maintained as the peak value.
), the actual measured value starts to rise in the middle of the rising process M2.

However, in this case, the measurement start time is detected by the rise rate of the peak value and the measurement time etc. are set, as shown in Figure 6, the measurement start time should originally be set at Xl. However, there was a drawback that there was a delay until the point X2 (between t+Lo) and the reference point was shifted. Furthermore, as shown in Figure 7, when the rate of increase in the peak value is slow, it is lower than the rate of increase at the time of measurement start X1, so there is a drawback that measurements are performed after point X3 without setting the time to start measurement. Ta.

In view of this, the present invention resets internal data such as peak values when the actual measured value drops by more than a predetermined value or when the falling state continues, so that the reference point at the start of measurement can be set accurately. The present invention provides an electronic thermometer that is designed to

(d) Means for Solving the Problems As shown in FIG. 1, this invention includes a temperature detection means for detecting temperature at a predetermined sampling period, and updates the peak value of the actual measured values of this temperature detection means. a holding means for holding the temperature, a determining means for determining a temperature drop when the actual measured value decreases by a predetermined value or more or a predetermined decrease value of the actual measured value continues for a certain period of time; It is configured to include a reset means for resetting, and a display means for displaying the peak value and the like.

(E) Function The electronic thermometer of the present invention detects the temperature at a predetermined sampling period, for example, every second, using the temperature detecting means, and updates the peak value among the actual 11 values of the temperature detecting means using the holding means. While holding, when the actual value of the temperature detection means decreases by more than a predetermined value, for example, by 0.3 degrees Celsius or more, or 0.1"
When the temperature decreases by C or more for 10 seconds or more, the determining means determines that the temperature has decreased, and based on the determination by the determining means, the resetting means resets internal data, such as the peak value.

(f) Example Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 2, reference numeral 1 denotes an electronic thermometer, which is designed to estimate a convergence temperature corresponding to body temperature from actual measurements.

This electronic thermometer 1 consists of a body 2 and a probe 3 that are integrally formed. A probe 3 is formed in the shape of a thin rod on the rectangular body 2, and a temperature sensor 4 such as a thermistor is attached to the tip of the probe 3. It is stored -).

On the other hand, the main body 2 is provided with a display 5, a one-touch power switch 6, and a buzzer 7, and a control circuit section 8 is housed inside.

As shown in FIG. 3, the control circuit section 8 is configured such that the detection signal of the temperature sensor 4 is converted into a digital signal by an A/D converter 9 and read into the CPU IO. Then, this CPU10 reads the detection signal of the temperature sensor 4, that is, the actual measurement value, at a sampling period of, for example, every - second,
A temperature detection means 11 is configured, and the CPU 10 is configured to store the measured value in the memory 12 and output it to the display 5. Further, the CPU I O receives a switching signal from the power switch 6 and is supplied with electric power from the electric rA 13, while a buzzer signal indicating the end of measurement is output to the buzzer 7.

The CPU 10 also has a holding function that sequentially updates and holds the highest peak value among the actual measured values during measurement;
It has an estimation function that calculates the estimated value of the convergence temperature from the actual measured value, a decision function that determines the decrease in the actual measured value, a reset function that resets internal data, and a start setting function that sets the measurement start time. If the value decreases or if a slight decrease continues for a number of seconds, the internal data is reset and the measurement start time is set.

Next, the configuration and operation of this electronic thermometer 1 will be explained based on the control flow shown in FIG. In addition, the step is ST
That's what it means.

First, when the power switch 6 is turned on, initialization is performed by the STI, and after flags and the like are set to O, it is determined whether one second has elapsed (ST2), and the following operations are performed every second. Then, the process returns to ST2. When this - second has elapsed, 1 is added to the timer t (ST3), and the temperature data T(t) is read (ST4), that is, the actual measurement value T(t) of the temperature sensor 4 is added to the CPU10 at a sampling period of one second. is read (temperature detection means 11).

Subsequently, it is determined whether this measured value T(t) is larger than the peak value Tp (ST5), that is, the peak value Tp which is the maximum value among the measured values T(t) after starting the operation.
It is determined whether or not to update. When the actual measurement value T(t) is larger than the peak value Tp, it is the normal initial measurement state,
This state will be explained first. In this case, the process moves from ST5 to ST6, and the down timer td, which will be described later, is set to O and the peak value T
p is updated and held (ST7: holding means). Next, it is determined whether or not the measurement is to be started, that is, whether the measurement start flag ST is 1 or not (5T8). Since it is 0 at the initial stage of operation, the process moves to ST9 and the difference between the measurement start flag ST and the actual measurement value T (t-2) from 2 seconds ago is determined. Determine whether the difference is 0.3℃ or more, and apply 5T until the temperature rises by 0.3℃ or more.
Moving to IQ, the peak value Tp is displayed on the display 5. Thereafter, it is determined whether the measurement is completed, that is, whether the power switch 6 is turned off or not, and the process returns to ST2 and the above-described operations are repeated until the measurement is completed. And the temperature rise for 2 seconds is 0
．． When the temperature reaches 3° C. or higher, the process moves from ST9 to 5T12, where the measurement start flag ST is set and the measurement time -t is set as the measurement start time ts. After setting this measurement start, 5
After moving to TLQ and displaying the peak value Tp, the determination in ST8 becomes YES at the next sampling time, the estimated value Ts is calculated at 5T13, and this estimated value TS is displayed on the display 5.
, and returns to ST2 via 5T11.

Then, the above process is repeated until the end of the measurement, the estimated value Ts is updated and displayed, and when the power switch 6 is turned off, the determination in 5TII becomes YES and the measurement ends.

If the actual measured value T(t) falls below the peak value Tp after starting this measurement, the determination in ST5 becomes NO and the process moves to 5T15, where it is determined whether the measurement start flag ST is 1 or not, and after the start of the measurement, the process moves to 5T16. , after setting the down timer Ld (to be described later) to 0, the peak value Tp is held (5T17: holding means),
The process moves to ST8 and the above-described operation is performed.

Next, if the temperature sensor 4 is kept warm, such as when turning off the power switch 6 and then turning on the power switch 6 after the measurement ends to start measurement again, or when the outside temperature is high, the S
The process from TI to ST5 is carried out in the same manner as described above, and the peak value Tp is
and the actual measurement value T(t) are compared, and when the actual measurement value T(t) is low, the process moves from ST5 to 5T15, and it is determined whether or not to start measurement. Since the measurement start flag ST has been reset in ST1, the process moves to 5T18, where it is determined whether the difference between the actual measurement value T (t) and the peak value Tp is 0.1°C or more, and the difference is 0.1°C.
When the temperature is below ℃, it is the same as before the start of normal measurement, so 5T1
6, the above-described operations are performed.

On the other hand, the difference between the measured value T (t) and the peak value 'rp is 0.
When the temperature is 1°C or more, the process moves from 5T18 to 5T19, and it is determined whether the difference is 0.3°C or more (temperature drop determination means). When the temperature is 0.3°C or more, the process moves to 5T20, and the internal data is stored. Reset (reset means). In other words, the actual measurement value T (t
-1), T (t-2) is set to the actual value T(t) at the current sampling time, and in addition to setting the down timer td (described later) to O, the actual value T(L) is set to the peak value Tp. Then, the process moves to 5TIO, displays the peak value Tp, and returns to ST2 via 5TII. Therefore,
As shown in FIG. 4, the peak value Tp in the previous measurement
When the current operation starts at the 71st point after the (actual measured value) rises along the curve L1, the peak value Tp of the 71st point is conventionally maintained, but the actual measured value T(t) decreases as if it were broken yALz.

Therefore, when 5T19 detects Y2 which has decreased by 0.3℃ and resets the internal data, and further decreases by 0.3℃, 73
At this point, it will be reset again and this operation will be repeated.

In addition, at 5T19, if the measured value T (t) has decreased by 0.1°C or more from the peak value Tp but has not decreased by 0.3°C or more, the process moves to ST21, counts up the down timer td, and checks whether 10 seconds have elapsed. Determine whether or not (ST22:
5 until 10 seconds have elapsed.
Move from T17 to 5TIO via ST8 and ST9, return to ST2 from 5T11 while displaying the peak value Tp,
If the temperature drops by 0.3°C or more within these 10 seconds, as described above (
While moving from STI9 to 5T20, after 10 seconds, 5
The process moves from T21 to 5T20 via 5T22, and the internal data is reset. Therefore, as shown in FIG.

The peak value Tp in the previous measurement rises at curve L3,
When the current operation starts at the 74th point, the conventional peak value 'rp of the 74th point is maintained, but the actual measured value T(t) decreases as indicated by the broken line L4. Therefore, the internal data is reset at point Y, which is 10 seconds after the 76th point where the measured value T (t) decreased by 0.1° C. or more.

When this reset operation from 5T19 to ST2 is repeated,
As shown in FIGS. 6 and 7, when the actual measurement value T(t) decreases as indicated by the broken line M at the beginning of the measurement, the peak value Tp
is reset (Sr20) and decreases along a stepwise broken line M4. Then, when the actual measured value T(t) rises from the decreased peak value Tp, it shifts from Sr5 to Sr6,
When the normal measurement operation described above is performed and the temperature rise for 2 seconds becomes 0.3°C or more, the measurement start time ts is set to point X1 (Sr1.5T12), and the measurement operation described above is performed. . Then, based on the setting of this measurement start time ts, the accuracy of the estimated value Ts, etc. is determined.

In this example, the reference value for the decrease in the measured value T([) was set at 0.3° C., but it is not limited to this, and the duration of the temperature decrease is also not limited to 10 seconds.

Further, in the electronic thermometer 1, the main body 2 and the probe 3 may be separate bodies.

(G) Effects of the Invention As described above, according to the electronic thermometer of the present invention, internal data is reset when the actual measured value of the temperature detection means decreases by more than a predetermined value or when the predetermined decreased value continues for a certain period of time. Therefore, even if the temperature detection means is kept warm before measurement starts, the internal data is reset as the actual measurement value decreases, so the reference point at the start of measurement can be set accurately, and subsequent measurement operations can be adjusted. can be done accurately.

[Brief explanation of drawings]

1 to 7 show an embodiment of the present invention, and FIG. 1 is a control flow diagram of an electronic thermometer according to an embodiment of the present invention.
Figure 2 is a front view of the electronic thermometer, Figure 3 is a circuit block diagram of the same, Figures 4 and 5 are diagrams showing different decreases in actual measured values, and Figures 6 and 7 are respectively FIG. 6 is a diagram showing actual measurement value changes during different measurements. 1: Electronic thermometer, 2: Main body, 3 Nib probe, 4: Temperature sensor, 5: Display,
10: CPU. 11: Temperature detection means. Patent applicant Tateishi Electric Co., Ltd. (and 1 others)
Agent: Patent Attorney Shigeru Nakamura No. 22 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] (1) Temperature detection means for detecting temperature at a predetermined sampling period; holding means for updating and holding a peak value among the actual measured values of the temperature detection means; a determining means for determining a temperature drop when a predetermined decrease in value continues for a certain period of time, a resetting means for resetting internal data such as the peak value based on the determination by the determining means, and a display means for displaying the peak value, etc. An electronic thermometer characterized by comprising: